/*-
 * Copyright (c) 1990 The Regents of the University of California.
 * All rights reserved.
 *
 * This code is derived from locore.s.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *      This product includes software developed by the University of
 *      California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include "DEFS.h"

        /*
         * memmove (dst,src,cnt)
         *  ws@tools.de     (Wolfgang Solfrank, TooLs GmbH) +49-228-985800
         */

ENTRY_NB(bcopy)
        xchgq   %rdi,%rsi
        /* fall into memmove */

NENTRY(memmove)
        endbr64
        RETGUARD_SETUP(memmove, r10)
        movq    %rdi,%r11       /* save dest */
        movq    %rdx,%rcx
        movq    %rdi,%rax
        subq    %rsi,%rax
        cmpq    %rcx,%rax       /* overlapping? */
        jb      1f
#ifdef memcpy_in_asm
        jmp     2f              /* nope */

ENTRY_NB(memcpy)
        RETGUARD_SETUP(memmove, r10)
        movq    %rdi,%r11       /* save dest */
        movq    %rdx,%rcx
2:
#endif
        cld                     /* copy forwards. */
        shrq    $3,%rcx         /* copy by words */
        rep
        movsq
        movq    %rdx,%rcx
        andq    $7,%rcx         /* any bytes left? */
        rep
        movsb
        movq    %r11,%rax
        jmp 3f
1:
        addq    %rcx,%rdi       /* copy backwards. */
        addq    %rcx,%rsi
        std
        andq    $7,%rcx         /* any fractional bytes? */
        decq    %rdi
        decq    %rsi
        rep
        movsb
        movq    %rdx,%rcx       /* copy remainder by words */
        shrq    $3,%rcx
        subq    $7,%rsi
        subq    $7,%rdi
        rep
        movsq
        movq    %r11,%rax
        cld
3:      RETGUARD_CHECK(memmove, r10)
        ret
#ifdef memcpy_in_asm
END_BUILTIN(memcpy)
#endif
END_BUILTIN(memmove)
END_WEAK(bcopy)